ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
The photon beam radiating from the position-stabilized storage ring tended to show large vertical drift at some beamlines. It had earlier been pointed that the beam drift might be due to the local floor displacement which was caused by the thermal distortion of the storage ring building. An estimate of the floor displacement was made by using a simulation model which takes into account the thermal stress due to the sunbeam heating of the buildings, and it seemed to give an explanation for the amount of photon-beam displacement. This raised a question whether the local floor movement is fully responsible for the apparent displacement of the photon beam. Detailed study was primarily carried out for beamline 4. First, the level of the beamline was surveyed and found to be small compared with the amount of beam displacement actually observed. Second, when beam displacement was measured with respect to two independent frames of reference located at the upstream and downstream ends of the beamline, no difference was found between the two. Both the level survey and the displacement measurement led us to conclude that the large photon-beam drift was produced not by the local floor movement, but by the beam itself.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1140899
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